/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { ComponentHarness, HarnessPredicate } from '@angular/cdk/testing';
import { MatTreeNodeHarness } from './node-harness';
import { TreeHarnessFilters, TreeNodeHarnessFilters } from './tree-harness-filters';
export declare type TextTree = {
    text?: string;
    children?: TextTree[];
};
/** Harness for interacting with a standard mat-tree in tests. */
export declare class MatTreeHarness extends ComponentHarness {
    /** The selector for the host element of a `MatTableHarness` instance. */
    static hostSelector: string;
    /**
     * Gets a `HarnessPredicate` that can be used to search for a tree with specific attributes.
     * @param options Options for narrowing the search
     * @return a `HarnessPredicate` configured with the given options.
     */
    static with(options?: TreeHarnessFilters): HarnessPredicate<MatTreeHarness>;
    /** Gets all of the nodes in the tree. */
    getNodes(filter?: TreeNodeHarnessFilters): Promise<MatTreeNodeHarness[]>;
    /**
     * Gets an object representation for the visible tree structure
     * If a node is under an unexpanded node it will not be included.
     * Eg.
     * Tree (all nodes expanded):
     * `
     * <mat-tree>
     *   <mat-tree-node>Node 1<mat-tree-node>
     *   <mat-nested-tree-node>
     *     Node 2
     *     <mat-nested-tree-node>
     *       Node 2.1
     *       <mat-tree-node>
     *         Node 2.1.1
     *       <mat-tree-node>
     *     <mat-nested-tree-node>
     *     <mat-tree-node>
     *       Node 2.2
     *     <mat-tree-node>
     *   <mat-nested-tree-node>
     * </mat-tree>`
     *
     * Tree structure:
     * {
     *  children: [
     *    {
     *      text: 'Node 1',
     *      children: [
     *        {
     *          text: 'Node 2',
     *          children: [
     *            {
     *              text: 'Node 2.1',
     *              children: [{text: 'Node 2.1.1'}]
     *            },
     *            {text: 'Node 2.2'}
     *          ]
     *        }
     *      ]
     *    }
     *  ]
     * };
     */
    getTreeStructure(): Promise<TextTree>;
    /**
     * Recursively collect the structured text of the tree nodes.
     * @param nodes A list of tree nodes
     * @param level The level of nodes that are being accounted for during this iteration
     * @param parentExpanded Whether the parent of the first node in param nodes is expanded
     */
    private _getTreeStructure;
    private _addChildToNode;
}